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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-28982] $currentDate modifiers should not use LogicalClock as source</title>
                <link>https://jira.mongodb.org/browse/SERVER-28982</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Esepcially when we switch the time to be purely logical.&lt;/p&gt;

&lt;p&gt;Here are the instances in the code that needs to be fixed:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/modifier_current_date.cpp#L232&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/modifier_current_date.cpp#L232&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/modifier_object_replace.cpp#L61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/modifier_object_replace.cpp#L61&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/insert.cpp#L170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/ops/insert.cpp#L170&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Implementation should provide backwards compatible behavior where the generated Timestamps are always unique.&lt;/p&gt;</description>
                <environment></environment>
        <key id="377796">SERVER-28982</key>
            <summary>$currentDate modifiers should not use LogicalClock as source</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Apr 2017 15:43:52 +0000</created>
                <updated>Tue, 6 Dec 2022 04:02:17 +0000</updated>
                                            <version>3.5.6</version>
                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3316079" author="asya" created="Fri, 31 Jul 2020 17:39:11 +0000"  >&lt;p&gt;We&apos;re moving away from $currentDate since we added &quot;$$NOW&quot; to agg, is this ticket still relevant? &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23656&quot; title=&quot;Current timestamp variable for aggregate expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23656&quot;&gt;&lt;del&gt;SERVER-23656&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
                            <comment id="2714204" author="sheeri.cabral" created="Thu, 9 Jan 2020 14:08:25 +0000"  >&lt;p&gt;I feel the query team should determine whether subsystems using $currentDate should rely on it to be unique, and then we can figure out what to do from there. $currentDate modifiers should be based on actual clock, not logical clock.&lt;/p&gt;</comment>
                            <comment id="1606955" author="tess.avitabile" created="Mon, 26 Jun 2017 20:13:16 +0000"  >&lt;p&gt;If this work is done after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28766&quot; title=&quot;Create CurrentDateNode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28766&quot;&gt;&lt;del&gt;SERVER-28766&lt;/del&gt;&lt;/a&gt;, be sure to change CurrentDateNode.&lt;/p&gt;</comment>
                            <comment id="1605679" author="misha.tyulenev" created="Fri, 23 Jun 2017 21:41:59 +0000"  >&lt;p&gt;While testing the changes realized that its not safe because there is no uniqueness guarantees. It may affect tools like mongooplog that insert currentDate into oplog.&lt;/p&gt;</comment>
                            <comment id="1558720" author="renctan" created="Wed, 26 Apr 2017 21:30:58 +0000"  >&lt;p&gt;They should be using something that is closely tied to the physical clock of the server, like one of the ClockSource from the ServiceContext.&lt;/p&gt;</comment>
                            <comment id="1558706" author="misha.tyulenev" created="Wed, 26 Apr 2017 21:19:27 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; Can you please clarify what should be used instead?&lt;/p&gt;</comment>
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